A mysterious echo seems to defy the laws of acoustics.

The world's first interactive human body museum also serves as a chair for a giant orange man.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

A swing to dangle you off the very edge.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

One of only two commuter aerial tramways in the United States.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Read a book next to a Midtown waterfall.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

A natural gas leak provides a flickering flame beneath a waterfall.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

A giant light 13 feet high shines near Thomas Edison's old Menlo Park lab.

The steepest classic funicular in the world glides along a dizzying incline.